JPS5934465B2 - Mold for continuous metal casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mold for continuous casting of metal.

The present inventors previously discovered that when casting molten metal into a continuous casting mold with both ends open that vibrates at a frequency of 5-50 KHz, the injection surface of the molten metal was placed near the antinode of the high-frequency vibration of the mold. We have developed a casting method to do this.

In other words, we improved the casting method using a mold that vibrates at high frequency cycles to minimize oscillation marks on the slab and reduce surface flaws, and to lubricate the mold and slab by making maximum use of the incident energy of high frequency vibrations. The aim is to promote

Furthermore, as a mold according to the present invention, for example, in Japanese Patent Application No. 53-3514, the present inventors arranged a vibrating connecting rod at right angles to the mold moving part, but this connection method is different from the method according to the present invention as described later. different.

The present invention further improves the above proposal, and the first
The invention provides a vibration cycle in which a horn of a high-frequency vibrator is attached perpendicularly to the vibration surface of a vibration connecting plate connected to the mold body, and the length of the horn on the vibration connecting plate is set as the vibration propagation velocity of the mold body. The purpose of the present invention is to provide a mold characterized in that the wavelength is 1/2 of the wavelength determined by .

Furthermore, as an embodiment of the first invention, there is provided a mold in which a vibrating connecting plate with a thick joint portion is connected to the mold body for attaching the horn.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an example of the present invention, and FIG. 2 is a schematic diagram showing essential parts of the present invention.

The mold for continuous casting of metal according to the present invention consists of wide mold surfaces 1 and 2 and narrow mold surfaces 3 and 3'.

The mold wide surface 1 has a vibration connecting plate 4, and a high frequency vibrator 5 of 5-50 KH2 is provided via a horn 6.

Experiments have shown that the horn 6 is particularly effective in utilizing vibration energy when it is perpendicular to the vibration plane of the vibration coupling plate.

Furthermore, it has been found that it is extremely effective to set the length h of the horn 6 to 4-4 of λ, which is determined by the vibration propagation velocity of the mold body and the applied vibration cycle.

The thickness of the vibration coupling plate plays an important role in the transmission of vibration energy.

In the present invention, maximum utilization of incident energy is confirmed by setting the relationship between the plate thickness t' of the vibration mold and the connecting portion 7 and the plate thickness t of the horn connection point to be t>t'.

FIGS. 3 and 4 are schematic diagrams showing the second invention.

That is, when installing the vibrating connecting plate 4 in the vibrating mold 2, it is extremely effective to interpose reinforcing rib members 8 on both sides of the vibrating connecting plate in order to increase the mechanical strength of the joint 7.

In this case, it is necessary to limit the thickness of the reinforcing rib material 8, as shown in a perspective view in FIG. 4, to avoid covering the entire area of the vibration coupling plate.

This is particularly important in preventing disturbances in high frequency vibration patterns.

Now, according to the method shown in the drawing, electric power 10
A high-frequency vibration of W, a frequency of 18 KHz, and a vibration amplitude of 40 μm when no load was applied to the vibration coupling plate was applied.

The vibration propagation speed of the mold vibration part is 3.6 x 105cI
rL/see (velocity of sound in a copper plate), and the wavelength λ was determined from the propagation velocity of vibration/vibration cycle.

Therefore, the horn h was set to λ/2=10.0 cm.

Cast ordinary carbon steel in this mold > 20cm x 4
A 0 cm square piece was cast at a drawing speed of 2 m/min.

The vibration intensity was 1.3 to 3 times higher than that of the horn without the h length at the same electrical input.

Furthermore, the surface properties of the test slabs were extremely good.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the present invention, FIG. 2 is a schematic diagram showing the main parts of the invention, FIG. 3 is a schematic diagram showing other main parts of the invention, and FIG. 4 is a schematic diagram showing the main parts of the invention. A perspective view showing an example of a reinforcing material is shown, respectively. 1.2...Mold wide surface, 3, 3'...Mold narrow surface, 4...Vibration connecting plate, 5...High frequency vibrator, 6... ...Horn, 8...Reinforcement rib.

Claims (1)

[Scope of Claims] 1. A horn of a high-frequency vibrator is attached at right angles to the vibration surface of a vibration coupling plate connected to the mold body, and the length of the horn on the vibration coupling plate is set to the vibration propagation velocity of the mold body. A mold for continuous metal casting, characterized in that the wavelength is 1/2 of the wavelength determined by the applied vibration cycle. 2. A mold for continuous casting of metal according to claim 1, characterized in that a vibrating connection plate is provided whose plate thickness at the horn connection point is smaller than the plate thickness at the vibrating mold connecting portion. 3 Attach the horn of a high-frequency vibrator perpendicularly to the vibration surface of the vibration coupling plate connected to the mold body, and set the horn length on the vibration coupling plate to the vibration propagation velocity of the mold body and the vibration cycle to be applied. A mold for metal connected casting, characterized in that reinforcing ribs are provided at both ends of the connecting portion between the vibrating connecting plate and the mold body.